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2. TECHNICAL SPECIFICATIONS and APPLICATION
The output of the hydraulic reversing pump is 1.0 cu in/sec. The
volume of the steering cylinder is approximately 13.1 cu in (215 cu-
bic centimeters). The rudder speed will be approximately 13 sec-
onds hard over to hard over (HOH).
The rudder speed, hard over to hard over (HOH), is determined
by dividing the volume (cu in) of the cylinder by the output of the
pumpset (cu in/sec).
The steering cylinder is capable of approximately 785 lbs of thrust
based on an output of 500 psi from the pump. The force or torque
applied to the rudder through the rudder shaft is dependent of the
distance between the center of the rudder shaft and the position
of the tiller bolt.
Figure 2 CYLINDER SCHEMATIC
Distance (rudder shaft to tiller bolt): 6” = 4,710 in/lb; 7” = 5,495 in/lb;
8” = 6,280 in/lb; 9” = 7,065 in/lb. The torque required to turn the rudder
can be calculated or obtained from the vessel’s builder.
Model Number LA11-12 LA11-24
Voltage 12 VDC 24 VDC
Output/Sec 1 cu in/sec 1.0 cu in/sec
Average Motor Amp 3-6 2-4
Solenoid Valve Amp 1.5 AMPS .75 AMP
Weight 15 lbs (7 kgs) 15 lbs (7 kgs)
35°
PORT
35° TRUNNION CENTER
45° TRUNNION CENTER
45°
PORT
35°
PORT
45°
PORT
RUDDER SHAFT
TILLER ARM
7.875"
23.25"
6.75"
4.5625"
6.0"
p02
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